Two more major Japanese electronic makers, Toshiba and Mitsubishi Electric, will begin selling 3D television sets this month.
The move follows Panasonic's entry into the market this spring followed by Sony and Sharp.
A private research company, BCN Incorporated, says 3D televisions last month accounted for 1.3 percent of total sales for the first time since the sets hit the market this April.
The makers are also promoting the sales of 3D camcorders and 3D movies that will allow people to make or provide software content that remains insufficient at present.
The 5 makers hope that sales of 3D TV sets will increase as consumers now have more choices.
BCN says consumers are expected to continue to replace old products with new ones through the year-end, thanks to a government incentive to buy eco-friendly electronic goods.
It says it is possible that up to 20 percent of television sales by year-end will come from 3D television sets.